Year	% (national estimate)
1976	25.935860058309036
1980	26.34347130116625
1981	26.695842450765866
1982	27.189481098849495
1985	28.239122574424492
1986	28.27044399476253
1987	28.285680668313915
1989	70.1501976284585
1990	61.79062483410309
1991	65.12698412698413
1992	62.065161828405394
1993	68.57142857142857
1994	69.375
1995	69.6334388185654
1996	75.94765951706461
1997	72.61239368165249
1999	74.12738220719902
2000	72.49179131703757
2001	79.31488801054019
2002	74.0119760479042
2003	76.71068427370949
2004	76.71068427370949
2005	75.36239103362391
2006	77.3024238597173
2007	77.2300053200922
2008	76.01212726320787
2009	76.70818440218122
2011	75.39692173237522
2012	72.46575684239414
2013	73.66566212547632
2014	75.00702049985959
2015	68.65567041273496
2016	73.22138187411869
2017	75.68174281268335
2018	79.44726058960532
2019	80.73729132977493
2020	74.10242708190935
2021	84.03568604774661
2022	84.4963246104087